低、无毒农药防治花灌木主要刺吸式口器害虫     

张淑萍  胡文华 《中国森林病虫》2001,(Z1)

在查清天津市园林主要花灌木刺吸口器害虫桃粉蚜、绣线菊蚜、棉蚜和山楂红蜘蛛发生消长规律的基础上 ,确定了防治适期和结合点 ,筛选出 10 %吡虫啉、绿灵、蚧螨灵、 1. 8%齐螨素和花保5种低、无毒药剂 ,防效均达到 90 %以上。查出天敌 13种 ,并对优势种作了取食量调查  相似文献   

槟榔红色素的抗氧化活性   总被引：2，自引：1，他引：1  

郑亚军  苏冰霞  陈卫军  李艳  赵松林 《热带作物学报》2009,30(6):881-884

测定槟榔红色素(areca red pigment,AP)对 DPPH·和·OH的清除能力、对脂质体过氧化的抑制能力、对Fe2+的络合能力,并测定其还原能力.结果表明:槟榔色素对DPPH·、·OH的清除能力较强:对脂质体过氧化的抑制能力很强,抑制率高达79.84%;与VE、没食子酸(gallic acid,GA)、BHT相比,槟榔色素的还原力、对Fe2+的络合能力较弱.说明槟榔红色素是较好的抗氧化剂.  相似文献   

Effect of dietary vitamins C and E fortification on lipid metabolism in red sea bream Pagrus major and black sea bream Acanthopagrus schlegeli     

HONG  JI  Ahmad Daud  OM  Takao  YOSHIMATSU  Masahiro  HAYASHI  Tetsuya  UMINO  Heisuke  NAKAGAWA  Masaya  ASANO  Atsushi  NAKAGAWA 《Fisheries Science》2003,69(5):1001-1009

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Polymerase chain reaction primers for highly selective detection of algicidal Proteobacteria     

Ryuji Kondo  Ichiro Imai 《Fisheries Science》2001,67(2):364-366

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黑龙江省西部地区重瓣白玫瑰引种栽培及繁育技术     

李荣岐  李波  赵玉恒  阎敦梁 《防护林科技》2001,(3):21-22

经在黑龙江省齐齐哈尔地区对重瓣白玫瑰引种栽培及繁育技术研究表明：该树种　１９９７～２０００年的平均抗寒指数为　２．７，冻害小于Ⅲ级，枝条冻伤长度小于　５０％，能正常开花，可以在此安家落户。同时对其形态特征、主要物候期、繁育技术和抚育管理作了介绍。  相似文献   

Salinity stress responses of a sterile mutant of Ulva pertusa (Ulvales, Chlorophyta)     

Makoto  KAKINUMA  Yoshinao  KUNO  Hideomi  AMANO 《Fisheries Science》2004,70(6):1177-1179

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Demography of Abutilon theoprasti and Setaria faberi in three crop rotation systems     

A H HEGGENSTALLER  & M LIEBMAN 《Weed Research》2006,46(2):138-151

Field experiments were conducted to characterize the demography of Abutilon theophrasti and Setaria faberi in a conventionally managed 2‐year (maize/soya bean) rotation, and in 3‐year (maize/soya bean/triticale + red clover) and 4‐year (maize/soya bean/triticale + lucerne/lucerne) rotations managed with 72% and 79% lower herbicide inputs respectively. Rates of weed seedling recruitment, seedling survival and adult plant fecundity were determined for populations in each phase of each rotation and used to calculate annual rates of weed population change, Δ. In both years of the study, Δ for A. theophrasti populations declined or remained stable in all three rotation systems. Despite greater rates of seedling survival and fecundity in maize and soya bean in the 3‐ and 4‐year rotations, increases in Δ for A. theophrasti populations were prevented in these systems because of low fecundity in triticale and low seedling survival and fecundity in lucerne. For Setaria faberi populations, Δ remained stable in the 2‐year rotation, increased in the 3‐year rotation in both years, and increased in the 4‐year rotation in 1 year. The results of this study indicate that when herbicide use is reduced, rotations that include triticale and lucerne can facilitate the suppression of A. theophrasti. Rotations that include lucerne can contribute to restraining S. faberi population growth, given adequate levels of seedling mortality in this crop.  相似文献   

Morphological characterization of the interaction between Diplocarpon rosae and various rose species     

O. Blechert  T. Debener † 《Plant pathology》2005,54(1):82-90

Blackspot, caused by Diplocarpon rosae , is the most severe and ubiquitous disease of garden roses, but information is lacking about genotype-specific forms of resistance and susceptibility of the host. Macro- and microscopic analyses of 34 rose genotypes with a defined monoconidial culture black spot inoculum identified susceptible and resistant rose genotypes and further genotype-specific subdivisions, indicating the presence of partial forms of resistance and different resistance mechanisms. In total, eight interaction types were characterized, five representing compatible (types 1–5) and three representing incompatible interactions (types 6–8). The incompatible interactions were characterized by the lack of any visible fungal structures beneath the cuticle (type 8), single-cell necroses (type 7) or necroses of larger cell clusters (type 6), the latter two types with penetration hyphae and haustoria in epidermal cells.  相似文献   

华山松,赤松次生韧皮部的解剖学观察   总被引：1，自引：0，他引：1  

贺晓 《内蒙古林学院学报》1995,(3):28-33

华山松，赤松次生韧皮部轴向系统由筛胞、韧皮部薄壁细胞及径向片组成，径向系统为射线。径向片和射线中具有蛋白细胞，其特点是细胞核大，细胞质浓，与筛胞之间以单侧筛域相联系。在无功能韧皮部，筛胞和蛋白细胞死亡，被挤毁，射线细胞分裂扩张，并积累后含物。  相似文献   

黑米天然黑(紫)色素的研究     

王景晨  王学增  王亚莉 《信阳农业高等专科学校学报》1992,(1)

特种稻黑米品种的糙米果皮中,含有大量的稀有天然黑(紫)色素。本文研究了这种色素的提取与分离方法、化学结构及其稳定性,并对其药理作用和应用前景作了简要分析。  相似文献